/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/PolygonFunctions.h
Set the specified vertex of a Simple Polygon. Returns the index of the added vertex.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="GeometryScript|SimplePolygon", Meta=(ScriptMethod)) static int32 AddPolygonVertex ( [FGeometryScriptSimplePolygon](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptSimplePolygon) Polygon, FVector2D Position )